一种微波多工器的网络综合方法研究

在滤波器多项式综合基础上,将多项式综合技术在多工器上做了推广,将传统的多项式综合技术从传统的双端口网络拓展到多端口网络,并且给出综合实例。该方法是在归一化频率中综合考虑各路滤波器之间的相互影响,运用迭代算法综合得到多工器的的特征多项式。最终综合结果满足设计指标,同时也验证了这种方法的可行性。     

多端口网络驱动点导纳矩阵函数的综合

本文提出了用（p + q）端口回转器综合多端口网络驱动点导纳矩阵函数,将多端口网络驱动点导纳矩阵函数Y(s)分解成G·Y_b(s)·G~T的形式,并且给出了求矩阵函数Yb(s)和矩阵G的方法。给出了Y（s）= G·Y_b(s)·G~T的综合电路。     

复合多端口网络的参数矩阵计算

一些电路教材对二端口网络的连接方式进行了介绍并给出复合二端口参数矩阵的计算方法。多个二端口的任意连接可以构成复合多端口网络,其参数矩阵也可以由构成它的二端口网络的参数矩阵表示。本文类比了电路网络中的关联矩阵,建立描述二端口和复合多端口关系的端口关联矩阵,并利用二端口的特性和串并联的特点,给出了求解复合多端口网络参数矩阵的新方法。     

多端口耦合问题的等效导纳矩阵

本文提出了一种处理多端口耦合问题的有效方法。在该问题中,各端口波导分别通过一耦合孔与耦合区进行耦合。利用矩量法,首先导出了多端口耦合问题的关于传输模和截止模的等效导纳矩阵的计算公式。在此基础上,考虑到截止模加载于端口波导的特性阻抗,经过适当的矩阵运算,得到仅仅关于传输模的等效导纳矩阵。用此方法计算了一个 H 面 T 形接头的等效导纳矩阵和等效电路参数,所得结果与文献[1]们的结果非要吻合。     

计算网络多端口多参数高阶灵敏度的简便方法

本文首次给出了函数矩阵Hadamard乘积的微分性质,在文献[1]的基础上,推得了网络多端口多参数二阶灵敏度的矩阵表达式。该文指出计算网络多端口多参数二阶灵敏度的简便方法,是通过一个所谓“基础子阵”的Hadamard乘积的简单运算来实现的,这个基本思想同样适用于更高阶情况。     

多工器的综合与设计

介绍了一种通过特征多项式综合多工器耦合系数的方法。该方法在低通原型频域中运用迭代算法计算优化多工器整体及各支路滤波器的特征多项式,综合得出的各支路耦合系数考虑进了多工器其余支路的影响,大幅缩短滤波器优化时间,且各支路滤波器的传输零点位置可根据需要指定。该方法也适用于双工器及三工器的推导。最终利用软件Ansoft Designer,综合设计并检验一个四工器,利用该方法得出的曲线与预期吻合。     

含源多端口网络源向量与参数矩阵间的关系

在电路课程中一端口网络的戴维南和诺顿定理为重点内容之一。从一端口扩展为多端口网络此两定理的表现,应予以关注。本文将给出含源多端口网络参数矩阵和源向量间的关系。以下为了叙述方便称含源的网络为含源网络,不含独立源的网络为非含独立源的网络,非含源网络仍可能是有源网络。非含源多端口网络可以用短路参数矩阵Y_0、开路参数矩阵Z_0或混合参数矩阵H表征。对含源多端口网络、全部端口开路情况下的各端口开路电压或全部端口短路情况下的各端口短路电流和部分端口开路,另一部分端口短路情况下的各端口电压和电流显然是不同的。为便于区分,以下对全部端口开路情况下的端口电压用V_(00?)表示,即,向量     

24端口矢量网络分析仪

R＆S ZNBT多端口网络分析仪频率范围覆盖9kHz到8．5GHz,最基本配置配备4个端口。根据需求可以最多扩展到24端口。该仪器主要针对多端口器件测试,其多端口特性可以使用并行模式,加速生产线测试。相比传统的开关矩阵方案,R＆S ZNBT每个端口独立,性能和普通2端口矢网相同。     

电网络基本元件群论确定

本文研究了二端口电网络元件体系中各元件集合之间、多端口电网络元件体系中各元件集合之间的群关系,结果表明,二端口电网络元件集合之间、2n端口电网络元件集合之间存在子群与陪集关系,基全这种元件集合之间的群关系,最后确定并用群论证明了二端口电网络基本元件是二端口有源回转器和二端口反照器,多端口电网络基本元件是（p q)端口回转器和2n端口反照器。     

MEMS系统级设计与基于多端口组件网络的建模方法

MEMS的系统级设计对保证其整体综合性能和合理开发MEMS产品至关重要。针对MEMS的多能量域耦合、多信号混合的特点以及能量非保守等特殊要求 ,提出了基于多端口组件网络的MEMS系统级建模方法———采用多端口组件表示MEMS的功能结构部件 ,组件与组件通过端口联成网络表示整个系统 ;用统一规范化的微分代数方程表征并用硬件描述语言表述多端口组件。针对梁等具体的MEMS功能结构部件 ,采用宏建模方法确定其行为方程 ,从而得到有特定物理意义的、可供重用的组件模型。最后 ,给出了微加速度计的基于多端口组件网络方法的系统级设计示例     

Innovations in microwave filters and multiplexing networks forcommunications satellite systems

The evolution of microwave filters and multiplexers for space application is described. The many advances are described within the context of the design of the overall communication subsystem. Emphasis is placed on the multipaction and passive intermodulation (PIM) considerations in designing high-power multiplexers. The impact of microwave filter technology in the channel characterization of satellite systems is described. The future directions of research and development are briefly discussed     

Efficient electromagnetic optimization of microwave filters and multiplexers using rational models

A method is presented for the efficient optimization of microwave filters and multiplexers designed from an ideal prototype. The method is based on the estimation of a rational function adjusted to a reduced number of samples of the microwave device response obtained either through electromagnetic analysis or measurements. From this rational function, a circuital network having the previously known topology of the microwave device is synthesized and compared to a circuital network with the desired response but including nonidealities. All of the process of analysis and model extraction can be seen as a model function that relates the physical parameters of the microwave device with the extracted circuital network parameters. Then, the error vector of the circuital parameters is used to generate a correction vector of the physical parameters through an estimation of the inverse of the Jacobian matrix of the complete model function. The Jacobian estimation is updated at each iteration of the optimization process with no need for additional evaluations of the model function. Two numerical examples of the proposed technique corresponding to the synthesis of a filter and a diplexer are presented, demonstrating the increased efficiency of the proposed technique with respect to direct electromagnetic optimization.     

一种915 MHz和2450 MHz双频微波加热分析

微波加热作为一种新型的加热方式在许多领域中得到了广泛的应用,与传统的加热方法相比,微波加热具有高效节能、选择加热、清洁无污染等特点。多源微波加热结构是实现微波均匀高效加热的有效手段,也是微波加热领域未来的发展趋势。在工业应用的多源微波加热腔体中,保证加热效率的同时如何提升加热均匀性始终是该领域的研究重点。本文在现有微波加热模型的基础上,提出了一种新型的双端口双频微波加热模型。本文基于有限元方法的多物理场仿真软件COMSOL Multiphysics 5.4设计了一种915 MHz和2450 MHz的双频微波加热模型,通过端口之间的正交和缝隙滤波器的设计减少了两个端口之间能量的互相耦合,在保证加热效率的同时提高了加热的均匀性。     

General Coupling Matrix Synthesis Method for Microwave Resonator Filters of Arbitrary Topology

This letter presents a new approach to synthesize the resonator filters of an arbitrary topology. This method employs an optimization method based on the relation between the polynomial coefficients of the transfer function and those of the S₂₁ from the coupling matrix. Therefore, this new method can also be applied to self‐equalized filters that were not considered in the conventional optimization methods. Two microwave filters, a symmetric 4‐pole filter with four transmission zeros (TZs) and an asymmetric 8‐pole filter with seven TZs, are synthesized using the present method for validation. Excellent agreement between the response of the transfer function and that of the synthesized S₂₁ from the coupling matrix is shown.     

多模腔体滤波器和多工器研究

基于金属腔体的窄带滤波器和多工器因其低插入损耗、高品质因数和高功率容量等优势已被广泛应用于通信、雷达、卫星和航空航天等领域。与单模谐振器相比,多模谐振器可以显著地减小电路的体积、重量,降低成本,并有效地提高频率选择性。文章概述了微波腔体滤波器与多工器的发展概况,包括窄带、宽带和多频带滤波器,双工器多工器,三状态双工器等组件。     

Recursive construction of FIFO optical multiplexers with switched delay lines

In this paper, we develop mathematical theory for recursive construction of first-in first-out (FIFO) optical multiplexers by the combination of (bufferless) crossbar switches and fiber delay lines (SDLs). We show that by cascading multistage SDL units, 2-to-1 multiplexers with a large buffer can be emulated exactly for both the departure process and the loss process from the multiplexer. Such results are extended to the case of n-to-1 multiplexers by introducing a new class of multiplexers, called delayed-loss multiplexers. A delayed-loss multiplexer has the same departure process as an ordinary multiplexer. However, lost packets due to buffer overflow in a multiplexer might be delayed. A key result from our theory is the self-routing n-to-1 multiplexer, where the routing path of a packet through the multistage SDL units can be determined upon its arrival.     

广义切比雪夫滤波器综合的统一理论

无线通信系统需要高性能的交叉耦合滤波器.交叉耦合滤波器的综合从给定的传输零点和回波损耗出发,直到得到各腔体之间的耦合系数.该文介绍在同一电路拓扑结构下提取耦合矩阵的统一理论,可同时实现带通和带阻滤波器的综合方法.     

一种计算光纤布拉格光栅谱特性的新方法

使用微波网络模型对光在光栅中的传播过程进行建模,给出了在光栅微波网络模型中的光场传输矩阵,并阐明了这种传输矩阵与传统分段光栅模型中的传输矩阵的关系;结合改进的有效折射率分析方法,提出了一种计算光纤光栅谱特性的新方法.该方法对应的MT矩阵很简洁且数值模拟的精度很高.     

Microwave superconductivity

This paper provides an overview of the microwave applications of high-temperature superconductor (HTS) technology. The main characteristics of HTS materials are outlined, highlighting the differences between superconductors and normal conductors. This paper presents recent progress in the development of HTS filters, multiplexers, cryogenic receivers, delay lines, and antennas. A brief summary of cryocooler technology and cryopackaging requirements is presented. The benefits of using HTS technology in wireless and satellite systems are also discussed. The intent of this paper is to provide perspective to newcomers in the field and to empower the potential end-users with current status and performance capabilities of HTS microwave devices     

The reentrant wide-band directional filter

A new type of a wide-band microwave filter is described and named the reentrant directional filter, in which resonance occurs in the form of a traveling wave rather than in the conventional form of a standing wave. This device is the network, which has the constant input impedance and is manufactured as the directional coupler's free construction. An analysis of the reentrant directional filter shows it to have advantages in the case of wide-bands when compared to previously used directional filters. This filter finds application in multiplexers, as well as in matched bandpass (band-stop) filters by using planar multilayer transmission-line technology. Experimental results verify the theoretical approach.